Engine Dyno data:
STS D30M 1.6 @ 25,000rpm 67.99 oz-in @35,000rpm 35,000rpm $130
STS28 is the same peak HP is at a lower rpm band than the STS D30M
Note: These are figures from the original release of the STS engines. The v2 motors are supposed to have a bit more torque, but not sure of...